I did not have my scale with me when I built my Hope SS wheels but they were claimed to be 380g.
I regret not going for something lighter like DT 240 SS with the 36 POE upgrade kit or the WTB SS hub which is claimed to be 318g (Unknown no. of POE).

I have managed to squeeze 7 cogs to the Hope hub by modifying a DA cassette, 8 will be a challenge :-)